code: def test_returns_empty_list_if_no_documents_are_provided(self):
      sampler = TopPSampler()
      output = sampler.run(documents=[])
      assert output["documents"] == []
  
file_path: haystack/test/components/samplers/test_top_p.py
imports: import random
  import pytest
  from haystack import Document, ComponentError
  from haystack.components.samplers.top_p import TopPSampler
label_desc: Use image node_id 4 for calling the TestTopPSampler obj's underlying member method code with example usage: obj.test_returns_empty_list_if_no_documents_are_provided() without return types